Question

which one is having lesser resistance a 220v, 60w bulb ,40w bulb? Give reason

Answer 1

220 V, 60 W as this bulb will glow more brightly indicating more heat is produced due to high resistance.

Jyoti Pant answered this

Power is defined as,

P=VI = (V 2 )/R

=> R=(V 2 )/P

Substitute the values of V and P

P=40W, V=220V,

 using the formula above, R=(220 2 )/40 = 1210ohms

P=60W, V=220V, similarly R=(220 2 )/60 = 806.67 ohms

The 1st one has greater resistance!


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Answer 2

Answer:

60w is having lesser resistence.

Explanation:

p=40w

v=22v

p=$v^{2}$/r

r=$v^{2}$/p

r=220^2/40=1210ohm

p=60w

v=22v

r=220^2/60=806.67